I have a platform that sends faxes via Email. When the Email
is generated, it puts the senders phone number in the "From:"
part of the header. So it looks like this:

From: "800-555-1212"@foo.com

SpamFilter is getting the correct "Mail from" but is converting this
address to "@foo.com" (no quotes however) and passing it on.
It is stripping the quoted field. (and thus becoming a protocol violation
for the downstream Mail Handlers......)

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